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EERI412 Practical 2 Microwave amplifier design

EERI 412

Practical Instruction 2:

Demonstration:

Report submission date:

Time required:

Microwave amplifier design – construction

and evaluation of matching network

2014-05-30

2014-06-02

10 hours preparation / 10 hours execution

1. Background

1.1 Microwave amplifier stub-matching design

The design and implementation of stub networks require more than just the paper

design of a matching circuit. Several practical considerations must be taken into

account, such as the effects of parasitic components on the network.

During the design process the designer must consider all the factors influencing the

design. Sometimes this implies that the designer must follow an iterative process

where the parameters are adjusted until the design is optimal for the application.

1.2 Implementation of a stub-matching network

The design and implementation can be summarized in the following ...view middle of the document...

Integration and evaluation of matching network in an RF system.

2. Definition of problem

You must design and build up a matching network. The network must be designed to

give maximum bandwidth with an acceptably low sensitivity with respect to design

parameters.

3. Specific instruction

You must work together in groups of 2 to solve the problem, but each person MUST

hand in a separate report discussing your own findings – NOT longer than 5 pages.

Each person must make his/her own conclusions (although you may cooperate in

finding the solutions). Under no circumstances may one person be alone in a group,

or three or more persons work together.

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EERI412 Practical 2 Microwave amplifier design

Work at 500 MHz in a 50 Ω system. Do the following specific work with deliverables

as indicated:

1. Design a SINGLE-STUB matching network to match a load of j50Ω to

provide an input impedance of 15 + j60Ω. Start at the load (50Ω) and

transform the load to give the required impedance;

2. Evaluate the matching circuit in terms of (a) sensitivity with respect to the

length of all cable segments (i.e., adjust each segment and determine the

effect on the mismatch losses), and (b) the bandwidth of the network (you

should use simulations to find sensitivity and bandwidth). You may evaulate a

few points and draw conclusions, or you may use Monte Carlo type analysis

to find a more general answer to the sensitivity question;

3. Build your matching network (using RG174 - 50Ω coaxial cable) for evaluation

in a demonstration session. Also bring Smith charts showing your predictions

of the matching network’s performance so that it can be compared to the

network analyzer results. Prepare your cables in such a way that it can easily

be soldered onto SMA connectors (look on the photos on e-Fundi to see what

an SMA connector looks like);

4. After the practical demonstration, each student must incorporate the

measured results, obtained during the demonstration, with the rest of the

report. The complete report must discuss the design and evaluation and will

serve as a final practical report for the semester (ONLY 5 pages allowed).

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